iTunes does nothing when I plug my iPhone in
I have an iPhone 5 32GB, a 2007 iMac 24", Mountain Lion 10.8.4 and iTunes 11.0.4 (4).
When I plug my iPhone into my Mac, absolutely nothing happens. If iTunes is closed, it doesn't open. If iTunes is open, no iPhone button appear in the top right corner and nothing changes in the sidebar.
I have also tried plugging it into my PC which has iTunes installed, and then the iPhone button does appear, but I don't want to sync it on that machine - I want to sync it on my Mac.
Any ideas?
iPhone 5, OS X Mountain Lion (10.8.4)